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If (" cos " (A+B))/(" cos " (A-B)) =("...

If `(" cos " (A+B))/(" cos " (A-B)) =(" sin " (C+D))/(" sin " (C -D)) ,` prove that tan A tan B tan C + tan D=0

A

0

B

`-1`

C

`sqrt3`

D

1

Text Solution

Verified by Experts

The correct Answer is:
D
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